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        <p>  回调中如何实现冒泡?</p>
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<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div 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class="line">112</div><div class="line">113</div><div class="line">114</div><div class="line">115</div><div class="line">116</div><div class="line">117</div><div class="line">118</div><div class="line">119</div><div class="line">120</div><div class="line">121</div><div class="line">122</div><div class="line">123</div><div class="line">124</div><div class="line">125</div><div class="line">126</div><div class="line">127</div><div class="line">128</div><div class="line">129</div><div class="line">130</div><div class="line">131</div><div class="line">132</div><div class="line">133</div><div class="line">134</div><div class="line">135</div><div class="line">136</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/*</span></div><div class="line">通过将记录每个属性的父级,当属性值变化,逐级寻找回调</div><div class="line">最开始,打算在data上附加父级信息,后来感觉头快爆炸了,实现太麻烦,无法通过属性来获取父级对象名字,</div><div class="line">最后想到元素的parentNode , 不需要做成链式的,每个子属性,只需要记住它的父元素就行了.</div><div class="line">*/</div><div class="line">	(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">		<span class="built_in">window</span>.Observer = <span class="function"><span class="keyword">function</span>(<span class="params">data</span>)</span>&#123;</div><div class="line">			<span class="keyword">this</span>.data=data;</div><div class="line">			<span class="keyword">this</span>.makeObserver();</div><div class="line">		&#125;;</div><div class="line">		<span class="keyword">var</span> oP = Observer.prototype;</div><div class="line">		oP.watchArr = &#123;&#125;;</div><div class="line">		<span class="comment">//保存父级信息</span></div><div class="line">		oP._parentNode = &#123;&#125;;</div><div class="line">		<span class="comment">//父级初始化为空</span></div><div class="line">		oP._parent = <span class="string">''</span>;</div><div class="line">		oP.makeObserver = <span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">			<span class="keyword">for</span>(<span class="keyword">var</span> key <span class="keyword">in</span> <span class="keyword">this</span>.data)&#123;	</div><div class="line">				<span class="keyword">if</span>(!<span class="keyword">this</span>.data.hasOwnProperty(key))<span class="keyword">return</span>;</div><div class="line">				<span class="keyword">var</span> val = <span class="keyword">this</span>.data[key];</div><div class="line">				<span class="comment">//设置父级表</span></div><div class="line">				<span class="keyword">this</span>._parentNode[key] = <span class="keyword">this</span>._parent;</div><div class="line">				<span class="keyword">if</span>(<span class="keyword">typeof</span> val === <span class="string">'object'</span>)&#123;</div><div class="line">					oP._parent = key;</div><div class="line">					<span class="comment">//递归时将当前key设置为父级</span></div><div class="line">					<span class="keyword">new</span> Observer(val);</div><div class="line">				&#125;;</div><div class="line">				<span class="keyword">this</span>.setObserver(val,key);</div><div class="line">			&#125;;</div><div class="line">		&#125;;</div><div class="line"></div><div class="line">		oP.setObserver = <span class="function"><span class="keyword">function</span>(<span class="params">val,key</span>)</span>&#123;</div><div class="line">			<span class="keyword">var</span> that = <span class="keyword">this</span>;</div><div class="line">			<span class="built_in">Object</span>.defineProperty(that.data,key,&#123;</div><div class="line">				<span class="attr">enumerable</span>: <span class="literal">true</span>,</div><div class="line">    			<span class="attr">configurable</span>: <span class="literal">true</span>,</div><div class="line">				<span class="attr">get</span>:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</div><div class="line">					<span class="keyword">return</span> val;</div><div class="line">				&#125;,</div><div class="line">				<span class="attr">set</span>:<span class="function"><span class="keyword">function</span>(<span class="params">newValue</span>)</span>&#123;</div><div class="line">					<span class="keyword">if</span>(<span class="keyword">typeof</span> newValue === <span class="string">'object'</span>)&#123;</div><div class="line">						<span class="keyword">new</span> Observer(newValue);</div><div class="line">					&#125;;</div><div class="line">					<span class="keyword">if</span>(val === newValue)<span class="keyword">return</span>;</div><div class="line">					<span class="comment">//触发set时,执行冒泡</span></div><div class="line">					oP.bubbleWatch(key,newValue,val);</div><div class="line">					val = newValue;</div><div class="line">				&#125;</div><div class="line">			&#125;);	</div><div class="line">		&#125;;</div><div class="line">		oP.bubbleWatch = <span class="function"><span class="keyword">function</span>(<span class="params">key,newValue,val</span>)</span>&#123;	</div><div class="line">			<span class="keyword">if</span>(<span class="keyword">this</span>.watchArr[key])&#123;</div><div class="line">			<span class="comment">//如果监听表存在key,执行一次</span></div><div class="line">				<span class="keyword">this</span>.implementWatch(key,newValue,val);</div><div class="line">			<span class="comment">//如果冒泡选项为false,则return</span></div><div class="line">				<span class="keyword">if</span>(!<span class="keyword">this</span>.watchArr[key].options.bubble)<span class="keyword">return</span>;</div><div class="line"></div><div class="line">			&#125;;</div><div class="line">			<span class="comment">//剩下冒泡为true的,递归调用父级属性的回调</span></div><div class="line">			parentKey = <span class="keyword">this</span>.getParent(key);</div><div class="line">			<span class="keyword">if</span>(parentKey)<span class="keyword">this</span>.bubbleWatch(parentKey,newValue,val);</div><div class="line">		&#125;;</div><div class="line">		oP.getParent = <span class="function"><span class="keyword">function</span>(<span class="params">key</span>)</span>&#123;</div><div class="line">			<span class="keyword">var</span> parent = <span class="keyword">this</span>._parentNode[key];		</div><div class="line">			<span class="keyword">return</span> parent;</div><div class="line">		&#125;;</div><div class="line">		oP.implementWatch = <span class="function"><span class="keyword">function</span>(<span class="params">key,newValue,val</span>)</span>&#123;			</div><div class="line">			<span class="keyword">for</span>(<span class="keyword">var</span> i = <span class="number">0</span>;i&lt;<span class="keyword">this</span>.watchArr[key].fn.length;i++)&#123;		</div><div class="line">					<span class="keyword">this</span>.watchArr[key].fn[i](newValue,val);</div><div class="line">				&#125;</div><div class="line">		&#125;;</div><div class="line">		oP.$watch = <span class="function"><span class="keyword">function</span>(<span class="params">key,fn,options</span>)</span>&#123;</div><div class="line">			options = extend(options,&#123;</div><div class="line">				<span class="attr">bubble</span>:<span class="literal">false</span></div><div class="line">			&#125;);</div><div class="line">			<span class="keyword">if</span>(!<span class="keyword">this</span>.watchArr[key])&#123;</div><div class="line">				<span class="keyword">this</span>.watchArr[key]=&#123;</div><div class="line">					<span class="attr">options</span>:options,</div><div class="line">					<span class="attr">fn</span>:[]</div><div class="line">				&#125;;</div><div class="line">			&#125;;		</div><div class="line">			<span class="keyword">this</span>.watchArr[key].fn.push(fn);</div><div class="line">			<span class="keyword">return</span> <span class="keyword">this</span>;		</div><div class="line">		&#125;;</div><div class="line">	&#125;)()</div><div class="line"></div><div class="line"><span class="keyword">var</span> app2 = <span class="keyword">new</span> Observer(&#123;</div><div class="line">    <span class="attr">name</span>: &#123;</div><div class="line">        <span class="attr">firstName</span>: <span class="string">'xiao'</span>,</div><div class="line">        <span class="attr">lastName</span>: &#123;</div><div class="line">        	<span class="attr">ming</span>:<span class="string">"ming"</span>,</div><div class="line">        	<span class="attr">liang</span>:<span class="string">"liang"</span></div><div class="line">        &#125;</div><div class="line">    &#125;,</div><div class="line">    <span class="attr">age</span>: <span class="number">25</span></div><div class="line">&#125;);</div><div class="line"></div><div class="line">app2.$watch(<span class="string">'name'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">newName</span>) </span>&#123;</div><div class="line">    <span class="built_in">console</span>.log(<span class="string">"name"</span>,newName)</div><div class="line">&#125;);</div><div class="line"></div><div class="line">app2.$watch(<span class="string">'firstName'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">newName</span>) </span>&#123;</div><div class="line">    <span class="built_in">console</span>.log(<span class="string">'firstName'</span>,newName)</div><div class="line">&#125;,&#123;<span class="attr">bubble</span>:<span class="literal">true</span>&#125;);</div><div class="line"></div><div class="line">app2.$watch(<span class="string">'ming'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">newName</span>) </span>&#123;</div><div class="line">    <span class="built_in">console</span>.log(<span class="string">'ming'</span>,newName)</div><div class="line">&#125;);</div><div class="line"></div><div class="line"></div><div class="line">app2.data.name.firstName = <span class="string">'ll'</span>;</div><div class="line">app2.data.name.firstName = <span class="string">'lll'</span>;</div><div class="line">app2.data.name.lastName.ming = <span class="string">'hong'</span>;</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line">输出:</div><div class="line">firstName ll ---触发watch</div><div class="line">name ll --- 冒泡到name上触发name的回调函数</div><div class="line">firstName lll</div><div class="line">name lll</div><div class="line">ming hong --- 没有冒泡,所以未触发name上的回调</div><div class="line"></div><div class="line">*/</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">extend</span>(<span class="params">x,y</span>)</span>&#123;</div><div class="line">    <span class="keyword">var</span> y=y||&#123;&#125;;</div><div class="line">	<span class="keyword">for</span>(<span class="keyword">var</span> i <span class="keyword">in</span> x)&#123;</div><div class="line">		<span class="keyword">if</span>(<span class="keyword">typeof</span> x[i] === <span class="string">"object"</span>)&#123;</div><div class="line">			y[i] = (x[i] <span class="keyword">instanceof</span> <span class="built_in">Array</span>) ? [] : &#123;&#125;;</div><div class="line">			extend(x[i],y[i])</div><div class="line">		&#125;<span class="keyword">else</span> &#123;</div><div class="line">　　　　　　y[i] = x[i];</div><div class="line">　　　　　&#125;</div><div class="line">	&#125;;</div><div class="line">	<span class="keyword">return</span> y;</div><div class="line">&#125;</div></pre></td></tr></table></figure>

      
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